Monitor turns off and is dim

\015 I have duel monitors, my optiquest Q9 started turning off randomly, and when i turn it back on its way dimmer then it used to be.. it keeps getting harder to turn on, and more dim! when it turns off it still has the green light on like it is still working but a black screen! but my other monitor is working just fine and has perfect everything.. things i have tried:1 i tried replacing the cords2 i tried switching the port that its in on my graphics card.3 hitting really hard lol4 crying :(5 and tried messing with the menu settings!pleas help me out and ty! for even trying!\015

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